55results about How to "Overcome lack of focus" patented technology

An optical joystick includes a first waveguide including a first reflecting surface located below a reading area for sensing the movement of an object and a first plano-convex lens portion condensing light reflected from the first reflecting surface, a second waveguide including a second plano-convex lens portion facing the first plano-convex lens portion and a second reflecting surface for reflecting light refracted at the second plano-convex lens portion, and an image sensor located below the second reflecting surface. The first reflecting surface and the first plano-convex lens portion form a single body, and the second plano-convex lens portion and the second reflecting surface also form a single body. The reflecting surface and the lens portion are in a single body, thereby notably reducing the thickness of the optical joystick. The first and second waveguides are facing each other, thereby improving refraction and condensing light.

A pickup lens is provided with various aberrations corrected satisfactorily, with a short optical length, and with a sufficient back focus secured.

The configuration comprises an aperture diaphragm S1, first lens L1, second lens L2, and third lens L3, and is configured by arranging, in order from the object side to the image side, the aperture diaphragm, first lens, second lens, and third lens. The first lens is a lens having positive refractive power, with convex surfaces on the object side and on the image side. The second lens is a lens having negative refractive power, in a meniscus shape with the convex surface on the image side. The third lens is a lens having negative refractive power, in a meniscus shape with the convex surface on the object side. Both of the surfaces of the first lens are aspherical, both of the surfaces of the second lens are aspherical, and both of the surfaces of the third lens are aspherical.

The present invention is an imaging lens in which various aberrations are satisfactorily corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side, and thus satisfies the following conditions.

0.40<r₁/r₂<0.65  (1)

0.08<D₂/f<0.1  (2)

0.2<D₃/f<0.3  (3)

1.0<d/f<1.5  (4)

0.4<b_f/f<0.6  (5)

where f is the focal length of the entire lens system,

• [0001]
  • r₁ is the radius of curvature (axial curvature radius) of the object-side surface of the first lens L1 in the vicinity of the optical axis,
  [0002]
  • r₂ is the radius of curvature (axial curvature radius) of the image-side surface of the first lens L1 in the vicinity of the optical axis,
  [0003]
  • D₂ is the interval between the first lens L1 and second lens L2,
  [0004]
  • D₃ is the thickness at the center of the second lens L2,
  [0005]
  • d is the distance(in air) from the object-side surface of the first lens L1 to the imaging surface, and
  [0006]
  • b_f is the back focus (in air).

The invention discloses a real-time pushing system and method for delivering an advertisement. The real-time pushing system comprises a client side, a merchant server side and a data maintenance server, wherein the merchant server carries out corresponding modification on areas, industries and time of advertisement delivering and advertisement content through relevant information statistics of advertisement browsing client sides by the data maintenance server. The real-time pushing method comprises the steps that firstly, the advertisement is delivered by a merchant through the merchant server, information of the client side is sent to the data maintenance server after the client side browses the advertisement, and the merchant carries out modification on the areas, industries and time of advertisement delivering and the advertisement content through the data maintenance server. According to the real-time pushing system and method for delivering the advertisement, the shortcoming of a traditional advertisement delivering mode that data modification is difficult to conduct after data research, collection and type setting at an earlier stage is avoided, and the shortcomings that when the advertisement is delivered in a public communication mode, pertinency of clients who the advertisement is delivered to is lacked, and the advertisement is prone to submergence by many other advertising merchants are also avoided.

A semiconductor device has a first region, a second region and a border region between the first region and the second region. The semiconductor device has an interlayer dielectric layer, covering at least the first region and the second region. A first wiring layer is located in the first region and defines a relatively small pattern. A second wiring layer is located in the second region and defines a relatively large pattern that is wider than the small pattern. A first dummy pattern is formed in the first region and a second dummy pattern is formed in the border region. The interlayer dielectric layer includes a planarization silicon oxide film. The planarization silicon oxide film is one of a silicon oxide film formed by a polycondensation reaction between a silicon compound and hydrogen peroxide, an organic SOG (Spin On Glass) film an inorganic SOG film and a silicon oxide film formed by reacting an organic silane with ozone or water. The interlayer dielectric layer located over the first wiring layer is thinner than the interlayer dielectric layer located over the second wiring layer such that a global height difference occurs in the border region between the first region and the second region.

A zoom lens includes a first lens group having negative refractive power and a second lens group having positive refractive power, each including at least one plastic aspherical lens. The zoom lens satisfies the following Conditional Expressions (1) and (2),

0.40<fw/bkw<0.60 (1)

0.01<|(X1−X0)/h0|<0.022 (2)

where,

• fw: focal length of the entire zoom lens in focus at infinity in a wide-angle end state;
• bkw: back focus when the entire zoom lens is in focus at infinity in the wide-angle end state;
• X1: thickness at an image-side effective diameter position of the plastic aspherical lens of the first lens group;
• X0: thickness at the center of the plastic aspherical lens of the first lens group; and
• h0: image-side effective radius of the plastic aspherical lens of the first lens group.

An imaging lens includes, from the object side to the image side, an aperture stop, a first lens with positive refractive power having a convex object-side surface near an optical axis, a second lens with positive refractive power having a convex image-side surface near the axis, a third lens with positive refractive power having a convex image-side surface near the axis, and a fourth lens with negative refractive power having a concave image-side surface near the axis, wherein all lens surfaces are aspheric, all lenses are made of plastic material, a diffractive optical surface is formed on at least one of the lens surfaces from the first lens image-side surface to the second lens image-side surface, and at least one of the three positive lenses satisfies expression (1):

1.58<Ndi  (1)

• • where
  • Ndi: refractive index of the i-th positive lens at d-ray.

There is provided a zoom lens which includes, in an order from an object side, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, and in which, during power variation from a wide-angle end to a telephoto end, a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and the zoom lens includes at least one cemented-triplet lens block having negative refractive power, in the fourth lens group.

An imaging lens consists of a first lens-group consisting of a positive lens with its surface that has the smaller absolute value of a curvature-radius facing an object-side, a positive lens in meniscus-shape with its convex-surface facing the object-side, a positive lens with its surface that has the smaller absolute value of a curvature-radius facing the object-side, and a negative lens with its surface that has the smaller absolute value of a curvature-radius facing an image-side, an aperture stop, a second lens-group consisting of a negative lens with its surface that has the smaller absolute value of a curvature-radius facing the object-side, a positive lens with its surface that has the smaller absolute value of a curvature-radius facing the image-side, and a positive lens, and a third lens-group consisting of a positive lens and a negative lens in this order from the object-side. A predetermined conditional expression is satisfied.

The invention discloses an ROI extraction method of a ground target of an unmanned aerial vehicle. The ROI extraction method of the ground target of the unmanned aerial vehicle comprises preprocessing a reference satellite image and extracting a mode which can reflect local features of a target; performing statistical analysis on mode distribution condition of a target region and an associated environment region, calculating a saliency value of every mode, and establishing a target visual saliency model; for a real-time image, obtaining the mode of every pixel point and a corresponding saliency value of the mode of every pixel point, wherein the saliency value corresponding to the mode of every pixel point corresponds to the visual saliency image of the real-time image; estimating a target rough position of the visual saliency image; estimating rough resolution of the real-time image with the target rough position as the center and by utilizing size distribution information of modes in a region with a size identical with that of the target region; obtaining an ROI basically identical with the resolution of the reference satellite image according to the target rough position and an estimated resolution value.

A projection zoom lens having broad angle of view, high zoom ratio, and large back focus while aberrations are corrected satisfactorily, including a negative first lens group, a positive second lens group, a positive third lens group, a negative fourth lens group, a positive fifth lens group, and a positive sixth lens group from the magnification side and is telecentric on the reduction side. When zooming, the first and sixth lens groups are fixed while the second to fifth lens groups are moved and the fourth lens group is composed of one negative lens whose magnification side surface has a greater curvature in absolute value than that of the reduction side surface, and the zoom lens satisfies conditional expression (1): −12.0<f4/fw<−5.0, where f4 is focal length of the fourth lens group, and fw is focal length of the entire lens system at the wide angle end.

A quasi-self focusing high intensity and large power ultrasonic transducer. It includes a backing and piezo-electric crystal sheets. The backing has double layer structure and there is an air cavity between the layers. At least four piezoelectric crystal sheets are adhered tightly on the inside focusing face of the backing. A protective layer is covered on the surface of the sheets.

A power varying operation is performed by moving four lens groups out of six lens groups. A reduction side of a zoom lens is constructed as a substantially telecentric system. An aspheric lens is arranged in a pupil neighboring position where an effective aperture becomes smallest. Conditional Expressions (1) to (5) are satisfied.

1.2≦bf/fw   (1)

|fa/fw|≦4.5   (2)

φa/φim≦1.0   (3)

|ffaw/fw|≦1.5   (4)

E≦300×10⁻⁷ (/° C.)   (5)

A pickup lens is provided with various aberrations corrected satisfactorily, with a short optical length, and with a sufficient back focus secured. The configuration comprises an aperture diaphragm S1, first lens L1, second lens L2, and third lens L3, and is configured by arranging, in order from the object side to the image side, the aperture diaphragm, first lens, second lens, and third lens. The first lens is a lens having positive refractive power, in a meniscus shape with the convex surface on the object side. The second lens is a lens having negative refractive power, in a meniscus shape with the convex surface on the image side. The third lens is a lens having negative refractive power, in a meniscus shape with the convex surface on the object side. Both of the surfaces of the first lens are aspherical, both of the surfaces of the second lens are aspherical, and both of the surfaces of the third lens are aspherical.

A projection lens includes, in order from a magnification side, a first lens group, a second lens group and a third lens group. The first lens group includes, in order from the magnification side, a negative lens whose lens made of a non-resin, a plastic lens at least one surface of which is aspheric and a positive lens. The second lens group includes a plastic lens at least one surface of which is aspheric, a positive lens and a negative lens. The third lens group includes a positive lens. The following conditional expressions are satisfied.

1.0<Bf/f≦1.8

2.0<f1/f

2.0<f2/f

where Bf denotes a air-conversion back focus of the entire system, f denotes a focal length of the entire system, f1 denotes a focal length of the first lens group and f2 denotes a focal length of the second lens group.